Bruno Wolff III <bruno@wolff.to> writes:
> > Whereas it shouldn't be hard to prove that this is equivalent:
> >
> > stark=> explain select col1 from test group by upper(col1),col1 order by upper(col1);
> > QUERY PLAN
> > ---------------------------------------------------------------------
> > Group (cost=88.50..98.23 rows=200 width=32)
> > -> Sort (cost=88.50..91.58 rows=1230 width=32)
> > Sort Key: upper(col1), col1
> > -> Seq Scan on test (cost=0.00..25.38 rows=1230 width=32)
> > (4 rows)
>
> I don't think you can assume that that will be true for any locale. If there
> are two different characters that both have the same uppercase version, this
> will break things.
No it won't.
--
greg